How does cirrhosis of the liver develop?

Many things. Cirrhosis is a scarring of liver tissue that results from chronic liver disease and leads to a decline in liver function. The most common causes of cirrhosis include chronic alcohol use, hepatitis b and c, and non-alcoholic fatty liver disease. Autoimmune disorders, medications, metabolic disorders, and biliary disorders may also lead to cirrhosis.
Numerous ways. There are many causes of liver cirrhosis. It basically develops from chronic inflammation of the liver with resultant scarring. Causes include but are not limited to: etoh, viral hepatitis, autoimmune hepatitis, nash, hemochromatosis, wilson's disease, etc.